https://admin.fedoraproject.org/ssh_known_hosts contains: {{{ proxy01.phx2.fedoraproject.org,apps.fedoraproject.org ssh-rsa AAAAB3NzaC1yc2[...] }}}
Either the file needs to be updated with the correct key or the hostname is wrong.
There should be no entry for apps.fpo, but there is one entry in /etc/hosts, making proxy01 believe it is apps.fpo: {{{ $ grep apps /etc/hosts 10.5.126.52 apps.fedoraproject.org
}}}
Fixed.
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